How much do you know about the EU? Take our quiz.

The EU, a coalition of European countries, accounts for 20 percent of the worlds imports and exports and continues to gain influence and power. This year, the strength and unity of the EU has been tested with the refugee crisis. But with the media's focus on the EU's response to migrants, it's worthwhile to take a step back and understand what the EU really is and how it came to be. Think you know the EU? Take our quiz.